// Window manipulation
// Copyright (C) 2021  Nguyễn Gia Phong
//
// This file is part of gfz.
//
// gfz is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// gfz is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with gfz.  If not, see <https://www.gnu.org/licenses/>.

usingnamespace @import("cimport.zig");
const Error = gfz.Error;
const Monitor = @import("Monitor.zig");
const checkError = gfz.checkError;
const getError = gfz.getError;
const gfz = @import("gfz.zig");

const Window = @This();
pimpl: *GLFWwindow,

/// Create a window and its associated context.
pub fn create(width: c_int, height: c_int, title: []const u8,
              monitor: ?Monitor, share: ?Window) Error!Window {
    const pmonitor = if (monitor) |box| box.pimpl else null;
    const pshare = if (share) |box| box.pimpl else null;
    const ptr = glfwCreateWindow(width, height, title.ptr, pmonitor, pshare);
    return if (ptr) |pimpl|
        Window{ .pimpl = pimpl }
    else
        getError();
}

/// Make the context current for the calling thread.
pub fn makeCurrent(self: Window) Error!void {
    glfwMakeContextCurrent(self.pimpl);
    try checkError();
}

/// Check the close flag.
pub fn shouldClose(self: Window) Error!bool {
    const flag = glfwWindowShouldClose(self.pimpl);
    try checkError();
    return flag == GLFW_TRUE;
}

pub fn swapBuffers(self: Window) Error!void {
    glfwSwapBuffers(self.pimpl);
    try checkError();
}